tesseract

From tessara- (“four-”) +‎ Ancient Greek ἀκτίς (aktís, “ray”).

tesseract (plural tesseracts)

1. (mathematics) The four-dimensional analogue of a cube; a 4D polytope bounded by eight cubes (in the same way a cube is bounded by six squares).
2. (science fiction) Any of various fictional mechanisms that explain extradimensional, superluminal, or time travel outside the geometry of the physical universe.

• (analogue of a cube): four-dimensional hypercube, 4-cube, 8-cell, octachoron, tetracube

• hypercube, polytope

• tesseractic

• tesseract on Wikipedia.Wikipedia
• Mathworld article on the tesseract

• rascettes